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a) \(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{637\times\left(526+1\right)-189}{526\times637+448}\)
\(=\frac{637\times526+637-189}{526\times637+448}\)
\(=\frac{637+526+448}{526\times637+448}\)
\(=1\)
b) \(\frac{64\times50+44\times100}{27\times38+146\times19}\)
\(=\frac{50\times\left(64+44\times2\right)}{19\times\left(27\times2+146\right)}\)
\(=\frac{50\times\left(64+88\right)}{19\times\left(54+146\right)}\)
\(=\frac{50\times152}{19\times200}\)
\(=\frac{152}{19\times4}\)
\(=\frac{38}{19}\)
\(=\frac{2}{1}\)
\(=2\)
\(\frac{64X50+44X100}{27X38+146X19}=\frac{64X50+44X2X50}{27X2X38+146X19}=\frac{64X50+88X100}{54X38+146X19}=\frac{50X\left(64+88\right)}{19X\left(54+146\right)}=\frac{50X152}{19X200}\)\(=\frac{̸5̸̸0X152}{19X4X̸5̸0}=\frac{152}{76}=2\) Đáp số :2
64x100+50x44
=2200+6400
=8600
1026+2774
=3800
mình làm đúng ko vậy
TL:
= 3800
nhé
K CHO MK NHAAAAAAA
BNNNNNNNNNNNNNNNNNNNNNNNNNN
~~HT~~
\(\frac{2}{1.2}+\frac{2}{2.3}+\frac{2}{3.4}+.......+\frac{2}{18.19}+\frac{2}{19.20}.\)
\(=2\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+........+\frac{1}{18.19}+\frac{1}{19.20}\right)\)
\(=2\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+.....+\frac{1}{18}-\frac{1}{19}+\frac{1}{19}-\frac{1}{20}\right)\)
\(=2\left(1-\frac{1}{20}\right)=\frac{2.19}{20}=\frac{19}{10}\)
\(\frac{2}{1.2}+\frac{2}{2.3}+\frac{2}{3.4}+...+\frac{2}{18.19}+\frac{2}{19.20}\)
\(=1+\frac{1}{2}-\frac{1}{2}+\frac{1}{3}-\frac{1}{3}+\frac{1}{4}-\frac{1}{4}+...-\frac{1}{19}+\frac{1}{20}\)
\(=1+\frac{1}{20}\)
\(=\frac{1}{20}\)
\(\frac{19,01\div0,1\times\left(208\times9+208\right)}{2,08\times100\div0,01}\)
\(=\frac{190,1\times\left(208\times9+208\times1\right)}{208\div0,01}\)
\(=\frac{190,1\times\left[208\times\left(9+1\right)\right]}{20800}\)
\(=\frac{190,1\times\left[208\times10\right]}{20800}\)
\(=\frac{190,1\times2080}{20800}\)
\(=\frac{190,1\times10\times208}{100\times208}\)
\(=\frac{1901}{100}\)
\(\frac{19,01\div0,1\times(208\times9+208)}{2,08\times100\div0,01}\)
\(=\frac{19,01\div\frac{1}{10}\times(208\times9+208\times1)}{208\div\frac{1}{100}}\)
\(=\frac{19,01\times10\times\left[208\times(9+1)\right]}{208\times100}\)
\(=\frac{19,01\times100\times208\times10}{208\times100}=19,01\times10=190,1\)
=2/2 - 2/3 - 2/4 - .........- 2/38 - 2/39 - 2/40
= 2/2 - 2/40
=1 - 2/40
=38/40
= 19/20